At a Certain Drag Race, Finishing Times (In Seconds) for Japanese

Short Answer

At a certain drag race, finishing times (in seconds) for Japanese cars and American cars are N(15,2) and N(16.1,3), respectively. If 9 American cars and 9 Japanese cars race, find the probability that the average race time of the Japanese cars is at least 2 seconds faster than that of the American cars.